Comparison of Combustion and Pyrolysis Behavior of the Peanut Shells in Air and N2: Kinetics, Thermodynamics and Gas Emissions

Abstract

The influences of four heating rates on the combustion and pyrolysis behavior in the N2 and air atmosphere were investigated by the Fourier transform infrared spectrometry (FTIR) and thermogravimetric (TG) analysis. the distributed activation energy model (DEAM) and Flynn-Wall-Ozawa (FWO) were used to estimate Ea and A, ΔH, ΔG and ΔS. Experimental results showed that the similar thermal behavior emerged, but the temperatures in the air and N2 atmospheres representing the end of the reaction were about 500 °C and 550 °C, respectively. The results of FTIR showed the peak positions were basically the same, but the concentrations of aromatics, aldehydes and ketones produced by pyrolysis in the N2 atmosphere were higher. When the heating rate was 20 K/min, the comprehensive combustion parameters were 56.442 and 6.871 × 10−7%2/(min2• K3) in the air and N2 atmospheres, respectively, indicating that the peanut shells had great potential to become bioenergy.

Kinetics modeling, thermodynamics and thermal performance assessments of pyrolytic decomposition of Moringa oleifera husk and Delonix regia pod

“…Again, a rise in heating rates led to a corresponding increase in the ignition, peak, and burnout temperatures with a corresponding decrease in time. This trend agrees with data in published literature 27 .…”

“…This agrees with findings from literature 34 . The average values of obtained in this study are relatively higher in comparison to peanut shell (29 kJ/mol) 27 , and Typha latifolia (179 kJ/mol) 34 . The degree of disorder for any reaction during thermal degradation process is determined by the change in entropy, .…”

“…It may thus be inferred that for both samples, the pyrolytic decomposition processes encounter endothermic reactions throughout the conversion limit. The difference between the average value of E θ and for both samples is approximately 5 kJ/mol—an indication of an ease of product formation from the pyrolytic process 27 . This agrees with findings from literature 34 .…”

“…The thermal parameters, namely, ignition temperature ( T i ), the temperature at the maximum DTG ( T max ), the burnout temperature ( T b ), the corresponding time ( t i , t max , t b ), the maximum and average DTG (− R p and − R v ) were obtained from TGA measurements 26 , 27 . These were subsequently used to calculate the performance parameters which include comprehensive flammability ( S ), flammability ( C ), ignition ( D i ) and burnout ( D b ) according to the formulas in Eqs.…”

Energy Utilization of Algae Biomass Waste Enteromorpha Resulting in Green Tide in China: Pyrolysis Kinetic Parameters Estimation Based on Shuffled Complex Evolution

“…Namely, a practical and feasible technology to solve the problem of green tide is to take advantage of these algae wastes for energy supply. At present, thermal-chemical conversion processes are regarded as an important energy utilization approach to algal biomass, especially pyrolysis [11][12][13][14]. Pyrolysis is not only a direct pathway for biomass thermal conversion, but also the first step in combustion and gasification reactions [7,[15][16][17][18].…”